# NTSB investigations: Lach BENSEN B-8M

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB BFO93LA149](https://openairdocs.org/ntsb/BFO93LA149.md): Lach Bensen B-8M · Fall River, MA · Accident · Serious injuries · Limited investigation · Final report · Sep 2, 1993 · N8447 · Substantial damage
  > FATIGUE FAILURE OF THE GYROCOPTER'S MAIN ROTOR CONTROL ARM. fACTORS RELATED TO THE ACCIDENT WERE: A LOOSE CLAMP ON THE ROTOR CONTROL ARM, DUE TO INADEQUATE MAINTENANCE OR INSPECTION, WHICH RESULTED IN CHAFING OF THE CONTROL ARM.
- [NTSB CHI79FEE72](https://openairdocs.org/ntsb/CHI79FEE72-134979.md): Lach/Bensen B8M · Rockford, IL · Accident · Minor injuries · Closed · Jul 20, 1979 · N8447 · Substantial damage

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1300804', '1302110'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1300804

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